netcore 3.1. hardcoded to the location of a 1.6gb text file

netcore linecount

class Program
{
static void Main(string[] args)
{
    var count = 0;

    using var reader = File.OpenText(@"C:\code\go\src\github.com\hyrmn\lc\pkg\lc\testdata\bigsum.txt");

    var buffer = new Span<char>(new char[1024]);
    int readLength;

    while ((readLength = reader.Read(buffer)) != 0)
    {
        var position = 0;

        while(true)
        {
            var slice = buffer.Slice(position, readLength - position);
            var idxOf = slice.IndexOf('\n');
            if (idxOf == -1)
            {
                break;
            }
            count++;
            position += idxOf + 1;
        }
    }

    Console.WriteLine(count);
}